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Molding phenolic resin material for pulley, and method of using molding resin material

a technology of phenolic resin and pulley, which is applied in the direction of portable lifting, tire parts, vehicle components, etc., can solve the problems of cracks in the vicinity of inserts, and achieve the effects of excellent mechanical strength, thermal shock resistance and stress relaxation, and superior mechanical strength

Inactive Publication Date: 2009-08-04
SUMITOMO BAKELITE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

The present invention provides a phenolic resin molding material for resin pulleys that have excellent mechanical strength, thermal shock resistance, and stress relaxation. The molding material includes a novolac type phenolic resin, glass fiber, inorganic substrate (other than glass fiber), and elastomer. By blending these ingredients in specific proportions, the molding material achieves a good balance of mechanical strength, thermal shock resistance, and stress relaxation. The resin molding material can be used to mold a variety of pulleys used as components for industrial machines and automobiles.

Problems solved by technology

On the other hand, when a pulley is fixed by introducing an insert inside the pulley, a crack may occur in the vicinity of the insert due to a difference in thermal expansion between the insert and the resin.

Method used

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  • Molding phenolic resin material for pulley, and method of using molding resin material

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examples

[0059]The present invention will be explained by way of examples and comparative examples. Mixtures of the formulations shown in Tables 1 and 2 were kneaded with heating rollers of different rotation speeds, and formed into sheets and cooled. These sheets were grinded to obtain granular phenolic resin molding materials.

[0060]The blended ingredient used in examples and comparative examples are as follows.[0061](1) Resol type phenolic resin was produced according to the following formulation.

[0062]A reaction vessel equipped with a reflux condenser stirrer, a heating device and a vacuum dehydrator was charged with phenol (P) and formaldehyde (F) in a molar ratio (F / P) of 1:7, and then added with 0.5 parts by weight of zinc acetate per 100 parts by weight of phenol. This reaction system was adjusted to pH 5.5, and allowed for refluxing reaction for 3 hours. Then the reaction was subjected to steam distillation at 100° C. for 2 hours under a degree of vacuum of 100 Torr, to remove unreac...

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Abstract

A resin molding material for making pulleys containing a novolac type phenolic resin, a glass fiber, an inorganic substrate other than the glass fiber, and an elastomer is described. The novolac type phenolic resin, ranges from 25% by weight to 45% by weight, the glass fiber together with the inorganic substrate other than the glass fiber ranges from 45% by weight to 65% by weight, and the elastomer ranges from 0.5% by weight to 5% by weight, relative to the entire molding material and are blended together. As the inorganic substrate other than the glass fiber, for example, calcium carbonate is used. As the elastomer, for example, NBR is used. The phenolic resin molding material is molded to obtain a resin pulley.

Description

TECHNICAL FIELD[0001]The present invention relates to a phenolic resin molding material for a pulley, a resin pulley, and a method for using the resin molding material.BACKGROUND ART[0002]Resin pulleys are commonly used as components of industrial machines or automobiles because they are light in weight and capable of lowering noises and lowering costs, compared to metallic pulleys. Among such resin pulleys, a pulley made of phenolic resin is more frequently used because it has advantages over a pulley made of thermosetting resin, typically of nylon that dimension accuracy is improved and deformation is less likely to occur.[0003]A pulley made of phenolic resin is requested to have mechanical strength, dimension reliability, and thermal shock resistance. Also a pulley made of phenolic resin is requested to have characteristics appropriate for its fixing manner. When a pulley is fixed by using a bolt, the pulley is requested to have excellent stress relaxation from the view point of ...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): F16H55/00C08K3/26C08K3/40C08K7/14C08L33/20C08L61/06F16H55/48
CPCC08K7/14C08L61/06F16H55/48Y10T29/49453C08L2666/04C08K3/26C08L29/14C08K2003/265
Inventor KOIZUMI, KOJI
Owner SUMITOMO BAKELITE CO LTD